Just a simple comment without getting into the pros, the cons, etc.

I think it depends upon how much confidence the writer has in his/her craft. Keep in mind that confidence does not necessarily translate into skill. One compliments the other, but they are not one-in-the same.

Some of the most skilled craftsmen in the world had little confidence in the work. They needed the affirmation that they were, indeed, talented. Other folks have the ability to recognize and fairly evaluate their own skills.

If you think you have the ability to honestly evaluate your songs, do so and submit without a professional critique. Go with your gut. However, if you don't have that same confidence in your ability to self-evaluate, look to a pro for that evaluation, and if necessary or desired, further assistance. In my opinion, it's not a one-size fits-all subject. Some of us have a worthy grasp of our skills; some of us do not. Proceed accordingly.

Alan